I bought 2 of the DS1052E's. Figure the price was right, and if I need a 4 channel scope, I can just trigger the second one off the first, and if one breaks, I still have one.
Anyway, I just did the USB mod. Followed the guide step by step, and it worked. Great.
So, of course I had to see what it does. So I hooked up a Tek TDS2022B 200Mhz 2GS/s, Rigol DS1052E with 100Mhz mod, and a regular DS1052E at 50Mhz. I hooked them all up at the same time to a HP 8116A Function Generator with a 15.46MHz(based on the Tek TDS measurement) Square Wave(unterminated). The results are in the pictures. Of course the 200Mhz looks the best, and the 100MHz looks pretty good, and the 50MHz doesn't capture the waveform like the other 2.
As for calibration issues every one is worried about, the modded unit measurements of rise time and Vpp are very close, while the unmodded 50Mhz unit has the worst measurements, compared to the Tek TDS2022B. I'm sure this is because of the lack of bandwidth, as the measurement can't be as accurate as the other 2.
So there you have it. I'm happy. Thanks again to the original poster with the dummy guide!